So much for my reviewing of season 9 - on the second episode, my DVD went corrupt before I'd even watched the episode. D'oh (oh, wrong show)! Anyway...
This isn't really one of my favourite episodes. I found it lacking in any real gags.
Cotton is a good character for the odd great line, but on the whole, Cotton-based episodes aren't generally amongst my favourites.
The sub-plot, of Dale, Peggy and Bobby trying to find a place to cool off during a heatwave, is much more pleasing. I did feel it lacked a final punch-line though (so wasn't all that surprised when I read that a final scene was intended, but dropped for time restraints).
All-in-all, one of the show's lesser episodes.